Revert "Stream handling simplified to avoid dictionary lookups in favor of array lookups with known indexes."

This reverts commit a84445ef2a.

PerfectNumbers.Core/PerfectNumberConstants.cs

@@ -15,7 +15,7 @@ public static class PerfectNumberConstants
     public const int MaxOddPowersCount = 128;
 	public const int PooledArrayThreshold = 64;
 	public static readonly int RollingAccelerators = 298; //SharedGpuContext.Device.MaxNumThreadsPerGroup;
-	public const int ThreadsByAccelerator = 2;
+	public const int ThreadsByAccelerator = 4096;
     // TODO: Load these limits from the benchmark-driven configuration so CPU and GPU scans stay aligned with the optimal
     // divisor-cycle datasets we generate offline.
     // TODO: Promote these magic numbers into a runtime profile derived from EvenPerfectBitScanner.Benchmarks so we can retune